Mikroelektronika MIKROE-742 데이터 시트

The mikroPacal PRO for AVR provides routines for implementing Software SPI com-
munication. These routines are hardware independent and can be used with any
MCU. The Software SPI Library provides easy communication with other devices via
SPI: A/D converters, D/A converters, MAX7219, LTC1290, etc.

Library configuration: 

- SPI to Master mode 
- Clock value = 20 kHz. 
- Data sampled at the middle of interval. 
- Clock idle state low. 
- Data sampled at the middle of interval. 
- Data transmitted at low to high edge. 

Note: The Software SPI library implements time-based activities, so interrupts need
to be disabled when using it.

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

var Chip_Select :
sbit; sfr; external;

Chip select line.

var Chip_Select :
sbit at PORTB.B0;

var SoftSpi_SDI :
sbit; sfr; external;

Data In line.

var SoftSpi_SDI :
sbit at PINB.B6;

var SoftSpi_SDO :
sbit; sfr; external;

Data Out line.

var SoftSpi_SDO :
sbit at PORTB.B5;

var SoftSpi_CLK :
sbit; sfr; external;

Clock line.

var SoftSpi_CLK :
sbit at PORTB.B7;

var
Chip_Select_Direction
: 

Direction of the Chip
Select pin.

var
Chip_Select_Direction
: 

sbit at DDRB.B0;

var
SoftSpi_SDI_Direction

: 

Direction of the Data In pin.

var
SoftSpi_SDI_Direction

: 

sbit at DDRB.B6;

var
SoftSpi_SDO_Direction

: 

Direction of the Data Out pin

var
SoftSpi_SDO_Direction

: 

sbit at DDRB.B5;

var
SoftSpi_CLK_Direction

: 

Direction of the Clock pin.

var
SoftSpi_CLK_Direction

: 

sbit at DDRB.B7;